Support arm



FIG. 1 is a perspective view of the support arm showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a bottom plan view;

FIG. 4 is a side elevational view;

FIG. 5 is an end elevational view;

FIG. 6 is an elevational view of the end opposite that shown in FIG. 5;and,

FIG. 7 is an elevational view of the side opposite that shown in FIG. 4.

The ornamental design for a support arm, as shown and described.